soc/mediatek/mt8196: Specify MTKLIB_PATH for building BL31
Add BL31 static library path to BL31 build argument.
BRANCH=rauru
BUG=b:
317009620
TEST=Build pass with and without static library. boot ok.
Change-Id: I858686ede3730fb70f71565ca3593e7eb4c460d2
Signed-off-by: Gavin Liu <gavin.liu@mediatek.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86252
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>